AAPT: error: duplicate value for resource 'attr/layout_anchorGravity' with config ''.

[warrenc5]

I upgraded to [email protected] and [email protected] gradle 4 etc
android build tools 28.0.3 cosswalk sdk too.

Now I'm getting

Task :app:mergeArm64DebugResources FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:mergeArm64DebugResources'.

java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource compilation failed
/home/wozza/.gradle/caches/transforms-1/files-1.1/design-23.1.1.aar/4a430900cc8ec13fad9fa91f4b47c7d5/res/values/values.xml:19:5-827: AAPT: error: duplicate value for resource 'attr/layout_anchorGravity' with config ''.

/home/wozza/.gradle/caches/transforms-1/files-1.1/design-23.1.1.aar/4a430900cc8ec13fad9fa91f4b47c7d5/res/values/values.xml:19:5-827: AAPT: error: resource previously defined here.

If I look in the file I see